I am about to go on a trip and want to take HDR photos during this trip. This means I need to update my iPhone 4 firmware to iOS 4.1... which means I need to know exactly what my options are for jailbreaking. So I ask: 1. Is there a working jailbreak for iOS 4.1 Final? (I am finding mixed information) 2. Is there a way to back up my existing firmware (4.0) so I can restore to this later if 4.1 ends up being un-jailbreakable? I have never done a jailbreak on an iPhone before but I will need to be able to since I will be moving out of the country and need a means of unlocking this thing. (FYI I'm a Mac user, so if you're providing instructions please provide them for Mac.) Thanks!